
.nav{
	position: fixed;
	top: 44px;
	width: 100%;
	z-index: 1000;
	border-bottom: 1px solid #ddd;
	border-top: 1px solid #ddd;
	background-color: #f6f6f6;
}
.nav ul li{
	width: 25%;
	float: left;
	list-style: none;
	text-align: center;
}
.nav ul li a{
	font-size: 16px;
	color: #808080;
	line-height: 35px;
}
.banner img{
	width: 100%;
	margin-top: 75px;
}
.about_us img{
	width: 100%;
	margin-top: 15px;
}
.about_us p{
	font-size: 12px;
	color: #555555;
	text-indent: 2em;
	margin-top: 12px;
	line-height: 15px;
}
